/*
 * Prototype/Scriptaculous corner plugin version 0.1 (6/29/2007)
 *
 * Based on the jQuery corner plugin version 1.7 (1/26/2007)
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 */

/**
 * The Effect.Corner class provides a simple way of styling DOM elements.
 *
 * Effect.Corner constructor takes two arguments:  new Effect.Corner(element, "effect corners width")
 *
 *   effect:  The name of the effect to apply, such as round or bevel.
 *            If you don't specify an effect, rounding is used.
 *
 *   corners: The corners can be one or more of top, bottom, tr, tl, br, or bl.
 *            By default, all four corners are adorned.
 *
 *   width:   The width specifies the width of the effect; in the case of rounded corners this
 *            will be the radius of the width.
 *            Specify this value using the px suffix such as 10px, and yes it must be pixels.
 *
 * For more details see: http://methvin.com/jquery/jq-corner.html
 * For a full demo see:  http://malsup.com/jquery/corner/
 *
 *
 * @example new Effect.Corner(element);
 * @desc Create round, 10px corners
 *
 * @example new Effect.Corner(element, "25px");
 * @desc Create round, 25px corners
 *
 * @name corner
 * @type scriptaculous
 * @author Ilia Lobsanov (first name @ last name dot com)
 */
Effect.Corner = Class.create();
Object.extend(Object.extend(Effect.Corner.prototype, Effect.Base.prototype), {
  hex2: function (s) {
    var s = parseInt(s).toString(16);
    return ( s.length < 2 ) ? '0' + s : s;
  },
  gpc: function (node) {
    for (; node && node.nodeName.toLowerCase() != 'html'; node = node.parentNode) {
      //var v = jQuery.css(node,'backgroundColor');
      var v = Element.getStyle(node, 'backgroundColor');
      if (v.indexOf('rgb') >= 0) {
        rgb = v.match(/\d+/g);
        return '#' + this.hex2(rgb[0]) + this.hex2(rgb[1]) + this.hex2(rgb[2]);
      }
      if (v && v != 'transparent')
        return v;
    }
    return '#ffffff';
  },
  getW: function (i) {
    switch (this.fx) {
      case 'round':  return Math.round(this.width * (1 - Math.cos(Math.asin(i / this.width))));
      case 'cool':   return Math.round(this.width * (1 + Math.cos(Math.asin(i / this.width))));
      case 'sharp':  return Math.round(this.width * (1 - Math.cos(Math.acos(i / this.width))));
      case 'bite':   return Math.round(this.width * (Math.cos(Math.asin((this.width - i - 1) / this.width))));
      case 'slide':  return Math.round(this.width * (Math.atan2(i, this.width / i)));
      case 'jut':    return Math.round(this.width * (Math.atan2(this.width, (this.width - i - 1))));
      case 'curl':   return Math.round(this.width * (Math.atan(i)));
      case 'tear':   return Math.round(this.width * (Math.cos(i)));
      case 'wicked': return Math.round(this.width * (Math.tan(i)));
      case 'long':   return Math.round(this.width * (Math.sqrt(i)));
      case 'sculpt': return Math.round(this.width * (Math.log((this.width - i - 1), this.width)));
      case 'dog':    return (i & 1) ? (i + 1) : this.width;
      case 'dog2':   return (i & 2) ? (i + 1) : this.width;
      case 'dog3':   return (i & 3) ? (i + 1) : this.width;
      case 'fray':   return (i % 2) * this.width;
      case 'notch':  return this.width;
      case 'bevel':  return i + 1;
    }
  },
  initialize: function(element, o) {
    element = $(element);
    o = (o || "").toLowerCase();
    var keep = /keep/.test(o);                       // keep borders?
    var cc = ((o.match(/cc:(#[0-9a-f]+)/) || [])[1]);  // corner color
    var sc = ((o.match(/sc:(#[0-9a-f]+)/) || [])[1]);  // strip color
    this.width = parseInt((o.match(/(\d+)px/) || [])[1]) || 10; // corner width
    var re = /round|bevel|notch|bite|cool|sharp|slide|jut|curl|tear|fray|wicked|sculpt|long|dog3|dog2|dog/;
    this.fx = ((o.match(re) || ['round'])[0]);
    var edges = { T:0, B:1 };
    var opts = {
      TL:  /top|tl/.test(o),       TR:  /top|tr/.test(o),
      BL:  /bottom|bl/.test(o),    BR:  /bottom|br/.test(o)
    };
    if (!opts.TL && !opts.TR && !opts.BL && !opts.BR)
      opts = { TL:1, TR:1, BL:1, BR:1 };
    var strip = document.createElement('div');
    strip.style.overflow = 'hidden';
    strip.style.height = '1px';
    strip.style.backgroundColor = sc || 'transparent';
    strip.style.borderStyle = 'solid';
    var pad = {
      T: parseInt(Element.getStyle(element, 'paddingTop')) || 0,     R: parseInt(Element.getStyle(element, 'paddingRight')) || 0,
      B: parseInt(Element.getStyle(element, 'paddingBottom')) || 0,  L: parseInt(Element.getStyle(element, 'paddingLeft')) || 0
    };

    if (/MSIE/.test(navigator.userAgent)) element.style.zoom = 1; // force 'hasLayout' in IE
    if (!keep) element.style.border = 'none';
    strip.style.borderColor = cc || this.gpc(element.parentNode);
    var cssHeight = Element.getHeight(element);

    for (var j in edges) {
      var bot = edges[j];
      strip.style.borderStyle = 'none ' + (opts[j + 'R'] ? 'solid' : 'none') + ' none ' + (opts[j + 'L'] ? 'solid' : 'none');
      var d = document.createElement('div');
      var ds = d.style;

      bot ? element.appendChild(d) : element.insertBefore(d, element.firstChild);

      if (bot && cssHeight != 'auto') {
        if (Element.getStyle(element, 'position') == 'static')
          element.style.position = 'relative';
        ds.position = 'absolute';
        ds.bottom = ds.left = ds.padding = ds.margin = '0';
        if (/MSIE/.test(navigator.userAgent))
          ds.setExpression('width', 'this.parentNode.offsetWidth');
        else
          ds.width = '100%';
      }
      else {
        ds.margin = !bot ? '-' + pad.T + 'px -' + pad.R + 'px ' + (pad.T - this.width) + 'px -' + pad.L + 'px' :
                    (pad.B - this.width) + 'px -' + pad.R + 'px -' + pad.B + 'px -' + pad.L + 'px';
      }

      for (var i = 0; i < this.width; i++) {
        var w = Math.max(0, this.getW(i));
        var e = strip.cloneNode(false);
        e.style.borderWidth = '0 ' + (opts[j + 'R'] ? w : 0) + 'px 0 ' + (opts[j + 'L'] ? w : 0) + 'px';
        bot ? d.appendChild(e) : d.insertBefore(e, d.firstChild);
      }
    }
  }
});

